Flora of North America species comparison

50-175 cm, erect;

nodes glabrous.

30-97 cm, erect;

nodes glabrous.

glabrous or pubescent, lower sheaths more frequently pubescent than the upper sheaths;

ligules 1.5-3.8 mm;

blades to 35 cm long, 2-16.5 mm wide, flat, mostly glabrous, adaxial surfaces with a few long hairs near the base.

glabrous or pubescent;

ligules 2.2-4.7 mm;

blades to 38 cm long, 2.3-6.2 mm wide, flat, glabrous or pubescent.

terminal, with 2-7 racemosely arranged branches;

branches 1.5-12 cm, racemose, divergent;

branch axes 0.7-1.4 mm wide, winged, glabrous, margins scabrous, terminating in a spikelet.

terminal, with 3-11 racemosely arranged branches;

branches 1.5-4 cm, divergent, occasionally arcuate, terminating in a spikelet;

branch axes 1.5-2 mm wide, broadly winged, glabrous or sparsely pubescent, margins scabrous, usually slightly conduplicate, occasionally purple.

2.3-4 mm long, 1.7-2.5 mm wide, paired, appressed to the branch axes, ovate, tapering to an acute apex, stramineous (rarely purple).

2.2-2.6 mm long, 1.2-1.5 mm wide, paired, imbricate, appressed to divergent from the branch axes, elliptic to obovate, stramineous (rarely purple-spotted), margins scabrous apically.

absent;

upper glumes and lower lemmas 5-7-veined, margins pilose;

upper florets stramineous.

absent;

upper glumes and lower lemmas glabrous, 5-veined, margins entire;

lower lemmas lacking ribs over the veins;

upper florets white to pale.

2-2.3 mm, white to brown.

2-2.2 mm, brown.

= 20, 40, 50-63.

= 40, 60.